摘要
土体在变荷载作用下的沉降历来是工程实际中不容忽视的疑难点,尤其在潮间带地区的港湾建设中.针对现有预测变荷载作用下土体沉降的复杂推导问题,笔者提出一种能够快速预测土体主固结沉降的方法.在大面积低频变荷载和近似Terzaghi一维固结条件下,根据已有的低频循环荷载作用下的土体固结沉降方程,分析了饱和土地基的变形特性.通过MATLAB编程计算,得到土体的主固结沉降值,发现其与变荷载时间曲线图面积相等的恒载(即与变荷载引起的冲量相等)所产生的最终沉降基本相同.同时,结合室内动三轴固结试验与实际工程对等效算法进行论证,发现此算法能准确预测土体的主固结沉降,预防工程事故,推进近海工程建设.
The settlement of soil under arbitrary load has always been a difficult point that could not be ignored in engineering practice,especially in the construction of the harbor in the intertidal zone.Aiming at the complex derivation problem of predicting the soil settlement under arbitrary load,a method for quickly predicting the settlement of soil consolidation has been proposed.Under large-area low-frequency variable loads and approximate Terzaghi one-dimensional consolidation conditions,on the basis of the existed soil consolidation settlement equation under arbitrary load,the deformation mechanism of saturated foundation has been analyzed.MATLAB programming calculations have been carried out to obtain the main consolidation settlement of soil,and the final settlement caused by the dead load(that is equal to the impulse caused by arbitrary loading)whose load-time map area is equal to the arbitrary load’s is almost the same.At the same time,the equivalent algorithm is demonstrated by the indoor dynamic triaxial-consolidation test and the actual engineering.It is found that this algorithm can accurately predict the main consolidation settlement of the soil,prevent engineering accidents,and promote the construction of offshore engineering.
作者
姜寒
鹿群
苏敏
孔晓龙
陈为石
JIANG Han;LU Qun;SU Min;KONG Xiaolong;CHEN Weishi(School of Civil Engineering,TCU,Tianjin 300384,China;Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment,TCU,Tianjin 300384,China)
出处
《天津城建大学学报》
2020年第3期178-184,共7页
Journal of Tianjin Chengjian University
基金
天津市应用基础与前沿技术研究计划一般项目(15JCYBJC48900)。
关键词
低频循环荷载
主固结沉降
等效算法
动三轴固结
low frequency cyclic load
main consolidation settlement
equivalent algorithm
dynamic triaxial-consolidation
